Optics: measuring and testing – For light transmission or absorption – Of fluent material
Patent
1994-01-14
1994-11-08
Rosenberger, Richard A.
Optics: measuring and testing
For light transmission or absorption
Of fluent material
250573, 422 78, G01N 2161
Patent
active
053631994
ABSTRACT:
A smoke opacity detector includes a sample chamber; a sample heating block in the sample chamber for heating a sample; a first temperature control for controlling the temperature of the sample heating block to a desired temperature; a measurement stack positioned above the sample heating block for receiving smoke resulting from heating of the sample by the sample heating block; a laser light source for projecting a light beam through the smoke in the measurement stack; a photodetector for detecting the amount of light from the laser light source that passes through the smoke in the measurement stack; a microprocessor for determining the amount of smoke resulting from heating of the sample, in response to the light detected by the photodetector; and a device for selectively eliminating conditions of water vapor in the determination of the amount of smoke by the microprocessor, the device for selectively eliminating including a heating device for heating the measurement stack and a second temperature control for selectively controlling the temperature of the measurement stack to a selected temperature above 100.degree. C. to render the water vapor gaseous and thereby eliminate affects of water vapor on the determination, and a temperature below 100.degree. C. to include affects of water vapor on the determination.
REFERENCES:
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patent: 5163332 (1992-11-01), Wong
patent: 5220179 (1993-06-01), Gagea
Katz Michael M.
Victor Bruce H.
Goldberg Richard M.
Rosenberger Richard A.
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